Which phenomenon is a major cause of the periodic glacial advances and retreats that have occurred over the last two million years?
A) The Pacific Decadal Oscillation (PDO)
B) El Niño Southern Oscillation (ENSO)
C) Periodic changes of Earth's orbit from more circular to more elliptical
D) Changes in the rate of continental drift
Correct Answer:
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Q40: During the summer, temperatures and plankton activity
Q41: Refer to the figure. Q42: The mixing that occurs at fall and Q43: On what time scale does the El Q44: El Niño events are associated with Q46: When Earth's orbit becomes more circular (i.e., Q47: Which statement about the Pacific Decadal Oscillation Q48: The pH of a sample of water Q49: In which aquatic ecosystems are oxygen concentrations Q50: In recent years, major episodes of very
A) greatly
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